I have been seeing popes embrace other Christians since the 1960s. Unless you are talking about Catholics who are very old now, this is the main norm we have known. We have little experience with anti ecumenism. But even though I remember the 1960s, I am aware of events since then.
The Episcopal Church, and to a greater or lesser extent other denominations, has taken positions totally at variance with Scripture, with the common core of Christian Tradition, and with the historic commitments of Anglicanism, or their own faith heritage, as expressed as recently as the 1960s. It is not so much churches moving “farther along the **Protestant **spectrum”, but some, not all, churches moving farther along the **secular **spectrum. It is not liberal churches embracing the current population of their society, but liberal churches embracing the power structure, as represented by the media.
It’s not a “feeling of pain” to recognize we are not living in the 1960s. It is prudence. I am not uncomfortable with popes reaching out to individuals in movements I disagree with, whether it be the secularized portions of Protestantism, Islam, or atheism. (People forget Pope Benedict wanted to give an address to a mostly atheistic audience at University of Rome, but unfortunately they cancelled him).
Vatican II never taught Catholics to always look back to the 1960s but to consider the signs of the times they are currently living in. New realities, such as the distinction between Anglicanism and the Continuum, are observed, and taken into account.